Cd2+ substituted nickel ferrite doped polyaniline nanocomposites as effective shield against electromagnetic radiation in X-band frequency

Abstract

Abstract Polyaniline encapsulated Cd 2+ substituted nickel ferrite nanocomposites with different weight ratio (polyaniline/NiCd ferrite = 15, 25 and 30%) have been synthesized via in situ polymerization. The XRD (X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), UV–Vis spectra and TEM (Transmission electron microscopy) analysis confirmed the successful formation of conducting–ferromagnetic polymer nanocomposites. Electrical properties (DC) of the samples were measured by the FPR (Four probe resistivity) technique. TGA (Thermo-gravimetric analysis) analysis indicated improved thermal stability of composites with rising ferrite content in the polymer matrix. These nanocomposites exhibit ferromagnetism at room temperature with the increased saturation magnetization from 13.92 to 23.49 emu/g as revealed by VSM (Vibrating sample magnetometer) results. From VNA (Vector network analyzer) study, it was found that the composite containing 30 wt% NiCdFe 2 O 4 showed the maximum SE T (42.7 dB) in X-band range due to the synergistic tuning of magnetic and conductive nanoparticles, presenting them as an effective EMI shield for various electrical, electronic and radiation equipments.